From the I answered the question, What Is the Local Church? That brings us to the next question: what is church membership?

Answer: It’s a declaration of citizenship in Christ’s kingdom. It’s a passport. It’s an announcement made in the pressroom of Christ’s kingdom. It’s the declaration that a professing individual is an official, licensed, card-carrying, bona fide Jesus representative.

More concretely, church membership is a formal relationship between a local church and a Christian characterized by the church’s affirmation and oversight of a Christian’s discipleship and the Christian’s submission to living out his or her discipleship in the care of the church.

Notice that several elements are present:

• a church body formally affirms an individual’s profession of faith and baptism as credible;

• it promises to give oversight to that individual’s discipleship;

• the individual formally submits his or her discipleship to the service and authority of this body and its leaders.

The church body says to the individual, “We recognize your profession of faith, baptism, and discipleship to Christ as valid. Therefore, we publicly affirm and acknowledge you before the nations as belonging to Christ, and we extend the oversight of our fellowship.” Principally, the individual says to the church body, “Insofar as I recognize you as a faithful, gospel-declaring church, I submit my presence and my discipleship to your love and oversight.”

The standards for church membership should be no higher or lower than the standards for being a Christian, with one exception. A Christian is someone who has repented and believed, and that’s who churches should affirm as members. The only additional requirement is baptism. Church members must be baptized, a pattern that is uniform in the New Testament. Peter said to the crowds in Jerusalem, “Repent and be baptized” (Acts 2:38). And Paul, writing the church in Rome, simply assumes that everyone who belongs to the Roman church has been baptized (Rom. 6:1–3).

Church membership, in other words, is not about “additional requirements.” It’s about a church taking specific responsibility for a Christian, and a Christian for a church. It’s about “putting on,” “embodying,” “living out,” and “making concrete” our membership in Christ’s universal body. In some ways, the union which constitutes a local church and its members is like the “I do” of a marriage ceremony, which is why some refer to church membership as a “covenant.”

It’s true that a Christian must choose to join a church, but that does not make it a voluntary organization. Having chosen Christ, a Christian has no choice but to choose to join a church.

From the I know, but notice the five parts of this definition:

• a group of Christians;
• a regular gathering;
• a congregation-wide exercise of affirmation and oversight;
• the purpose of officially representing Christ and his rule on earth—they gather in his name;
• the use of preaching and ordinances for these purposes.

Just as a pastor’s pronouncement transforms a man and a woman into a married couple, so the latter four bullet points transform an ordinary group of Christians spending time together at the park—presto!—into a local church.

The gathering is important for a number of reasons. One is that it’s where we Christians “go public” to declare our highest allegiance. It’s the outpost or embassy, giving a public face to our future nation. And it’s where we bow before our king, only we call it worship. The Pharaohs of the world may oppose us, but God draws his people out of the nations to worship him. He will form his mighty congregation.

The gathering is also where our king enacts his rule through preaching, the ordinances, and discipline. The gospel sermon explains the “law” of our nation. It declares the name of our king and explains the sacrifice he made to become our king. It teaches us of his ways and confronts us in our disobedience. And it assures us of his imminent return.

Through baptism and the Lord’s Supper, the church waves the flag and dons the army uniform of our nation. It makes us visible. To be baptized is to identify ourselves with the name of the Father, the Son, and the Holy Spirit, as well as to identify our union with Christ’s death and resurrection (Matt. 28:19; Rom. 6:3-5). To receive the Lord’s Supper is to proclaim his death and our membership in his body (1 Cor. 11:26-29; cf. Matt. 26:26-29). God wants his people to be known and marked off. He wants a line between the church and the world.

What is the local church? It’s the institution which Jesus created and authorized to pronounce the gospel of the kingdom, to affirm gospel professors, to oversee their discipleship, and to expose impostors. All this means, we don’t “join” churches like we join clubs. We submit to them.